language: c

cache:
  directories:
    - $HOME/.cabal/packages
    - $HOME/.cabal/store
    - $TRAVIS_BUILD_DIR/dist-newstyle

before_cache:
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/build-reports.log
  # remove files that are regenerated by 'cabal update'
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/00-index.*
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/*.json
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.cache
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar
  - rm -fv $HOME/.cabal/packages/hackage.haskell.org/01-index.tar.idx

  - rm -rfv $HOME/.cabal/packages/head.hackage

matrix:
  include:
    - compiler: "ghc-8.2.2"
      addons: {apt: {packages: [cabal-install-2.4,ghc-8.2.2], sources: [hvr-ghc]}}
    - compiler: "ghc-8.4.4"
      addons: {apt: {packages: [cabal-install-2.4,ghc-8.4.4], sources: [hvr-ghc]}}
    - compiler: "ghc-8.6.5"
      addons: {apt: {packages: [cabal-install-2.4,ghc-8.6.5], sources: [hvr-ghc]}}
    - compiler: "ghc-8.8.1"
      addons: {apt: {packages: [cabal-install-3.0,ghc-8.8.1], sources: [hvr-ghc]}}

before_install:
- mkdir -p $HOME/.local/bin
- "PATH=/opt/ghc/bin:$HOME/local/bin:$PATH"
- ghc --version
- cabal --version

install:
- cabal v2-update -v
- cabal v2-configure --enable-benchmarks --enable-tests --write-ghc-environment-files=always -j2
- cabal v2-build --only-dependencies

script:
- cabal v2-build
- cabal v2-run test
- cabal v2-run examples
- cabal v2-haddock
- cabal v2-sdist
- cabal check